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JoVE Encyclopedia of Experiments
Immunology
针对中和抗体的流感病毒逃逸变异的产生
针对中和抗体的流感病毒逃逸变异的产生
Encyclopedia of Experiments
Immunology
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Encyclopedia of Experiments Immunology
Generation of Influenza Virus Escape Variants against Neutralizing Antibodies

针对中和抗体的流感病毒逃逸变异的产生

Protocol
461 Views
03:20 min
July 8, 2025
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Please note that some of the translations on this page are AI generated. Click here for the English version.

Transcript

服用含有野生型和突变毒株的流感病毒混悬液。

一种称为血凝素或 HA 的病毒包膜糖蛋白与宿主细胞表面的唾液酸结合,介导病毒进入。

添加与 HA 结合的浓度递减的中和抗体,阻断唾液酸结合位点。

在

HA中携带有助于避免抗体中和的突变的突变株被称为逃逸变异。

将

混合物注射到无病原体的胚胎鸡蛋中,将病毒输送到尿囊液中,然后孵育。

抗体中和的病毒不能进入绒毛膜尿囊膜的细胞。未中和的突变病毒进入细胞、复制并释放到尿囊液中。

收获含有病毒种群的尿囊液。

引入浓度递减的 HA 特异性抗体,中和除逃逸变体之外的其他菌株。

引入鸡红细胞或红细胞。未中和的逃逸变异与细胞结合,导致红细胞聚集——称为血凝,确认逃逸变异的产生。

通过

首先制备4种稀释液的目标抗体,以增加浓度的目标抗体,以每次稀释液100微升的体积进一步分析具有HI活性的中和抗体。接下来,在400微升体积的1倍PBS中制备每毫升100万个斑块形成单位的病毒储备液。

然后,将每毫升病毒 100 微升 100 万个斑块形成单位与 100 微升每种抗体稀释液或 100 微升 1 倍 PBS 混合。将样品在37摄氏度的培养箱中与5%二氧化碳孵育一小时。

短暂涡旋后,将每种混合物200微升注射到特定的无病原体胚胎鸡蛋中。然后,将鸡蛋在37摄氏度下孵化,不含二氧化碳40至44小时。孵化后,将病毒感染的受感染胚胎卵置于 4 摄氏度下至少 6 小时,将其处死。接下来,如前所述从鸡蛋中收获尿囊液。

最后,通过执行文本协议中所述的HI测定来确认逃逸变体。

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